From 4ad9d4e444e4f75fd388078b617c411bfab762c8 Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Thu, 12 May 2016 09:50:36 +0200
Subject: prefer_openssl: add amd64 constraint

Optimized assembly versions for Go GCM are only available
on amd64.
---
 internal/prefer_openssl/prefer_go1.5.go | 7 ++++---
 internal/prefer_openssl/prefer_go1.6.go | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

(limited to 'internal/prefer_openssl')

diff --git a/internal/prefer_openssl/prefer_go1.5.go b/internal/prefer_openssl/prefer_go1.5.go
index 4b681e7..51a07ab 100644
--- a/internal/prefer_openssl/prefer_go1.5.go
+++ b/internal/prefer_openssl/prefer_go1.5.go
@@ -1,9 +1,10 @@
-// +build !go1.6
-// = go 1.5 or lower
+// +build !go1.6 !amd64
+// not go1.6+ OR not amd64
 
 package prefer_openssl
 
 func PreferOpenSSL() bool {
-	// OpenSSL is always faster than Go GCM on old Go versions.
+	// OpenSSL is always faster than Go GCM on old Go versions or on anything
+	// other than amd64
 	return true
 }
diff --git a/internal/prefer_openssl/prefer_go1.6.go b/internal/prefer_openssl/prefer_go1.6.go
index 5d0f426..898db0c 100644
--- a/internal/prefer_openssl/prefer_go1.6.go
+++ b/internal/prefer_openssl/prefer_go1.6.go
@@ -1,10 +1,11 @@
-// +build go1.6
-// = go 1.6 or higher
+// +build go1.6,amd64
+// go1.6+ AND amd64
 
 package prefer_openssl
 
 // PreferOpenSSL tells us if OpenSSL is faster than Go GCM on this machine.
-// Go GCM is fastern when the CPU has AES instructions and Go is v1.6 or higher.
+// Go GCM is faster when the CPU has AES instructions and Go is v1.6 or higher
+// on amd64.
 //
 // See https://github.com/rfjakob/gocryptfs/issues/23#issuecomment-218286502
 // for benchmarks.
-- 
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